X ( 2 , 5 , 3 , 6 ) X ( 4 , 11 , 1 , 12 ) X ( 6 , 1 , 7 , 2 ) X ( 8 , 15 , 9 , 16 ) X ( 10 , 13 , 5 , 14 ) X ( 12 , 3 , 13 , 4 ) X ( 14 , 7 , 15 , 8 ) X ( 16 , 9 , 11 , 10 ) {\displaystyle X(2,5,3,6)X(4,11,1,12)X(6,1,7,2)X(8,15,9,16)X(10,13,5,14)X(12,3,13,4)X(14,7,15,8)X(16,9,11,10)}